SQL SERVER

查看所有表名：

select name from sysobjects where type='U'

查询表的所有字段名：

Select name from syscolumns Where ID=OBJECT_ID('表名')

select * from information_schema.tables

select * from information_schema.views

select * from information_schema.columns

查询某个表的列名称、说明、备注、类型等

------sqlserver 查询某个表的列名称、说明、备注、类型等

SELECT

表名 = case when a.colorder=1 then d.name else '' end,

表说明 = case when a.colorder=1 then isnull(f.value,'') else '' end,

字段序号 = a.colorder,

字段名 = a.name,

标识 = case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,

主键 = case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id and name in (

SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then '√' else '' end,

类型 = b.name,

占用字节数 = a.length,

长度 = COLUMNPROPERTY(a.id,a.name,'PRECISION'),

小数位数 = isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),

允许空 = case when a.isnullable=1 then '√'else '' end,

默认值 = isnull(e.text,''),

字段说明 = isnull(g.[value],'')

FROM

syscolumns a

left join

systypes b

on

a.xusertype=b.xusertype

inner join

sysobjects d

on

a.id=d.id and d.xtype='U' and d.name<>'dtproperties'

left join

syscomments e

on

a.cdefault=e.id

left join

sys.extended_properties g

on

a.id=G.major_id and a.colid=g.minor_id

left join

sys.extended_properties f

on

d.id=f.major_id and f.minor_id=0

where

d.name='Sys_User' --如果只查询指定表,加上此where条件，tablename是要查询的表名；去除where条件查询所有的表信息

order by

a.id,a.colorder

MySql

查询表的所有字段名：

select *

from information_schema.columns

where table_name='table_name'

and table_schema='table_schema'

ORDER BY ORDINAL_POSITION

ACCESS

查看所有表名：

select name from MSysObjects where type=1 and flags=0

MSysObjects是系统对象，默认情况是隐藏的。通过工具、选项、视图、显示、系统对象可以使之显示出来。

Oracle

select cname from col where tname='ZW_YINGYEZ'

select column_name from user_tab_columns where table_name='ZW_YINGYEZ'

查询表字段数

select count(column_name) from user_tab_columns where table_name='表名';